Hi,
Is the mapping between serial number and ROM version documented somewhere? I'm most interested in when the change from ROM-P to ROM-R happened. The only thing I've found is an old post by Dave Arnett over at comp.sys.hp48 which says "...I released Rev R to production in late 1993". So, presumably the change happened late -93 or early -94 but does anyone know for shure?
48G(X) serial number vs. ROM version
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11-27-2005, 06:00 PM
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11-27-2005, 07:59 PM
You may find this info in one more recent comp.sys.hp48 FAQ you can get at: http://www.hpcalc.org/hp48/docs/faq/ I remember my first 48GX (Made in Singapore), purchased brand new in Aug/93, still had the Rev P ROM. Regards, Gerson. ▼
11-28-2005, 06:39 AM
Thanks for the reply! But no, I can't find the answer in the comp.sys.hp48 FAQ ( the latest version seems to be v4.62, 14 April 2000 ). One could put the question a little different, like this: what is the highest known serial number with ROM version P ( or the lowest known number with ROM version R )? Thanks, Bo
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11-28-2005, 01:49 PM
I too am curious about the mapping of Serial Number to OS Version number and Display type (at least two types were used in the HP48G series). Also, when were double-shot injected keys done away with? TomC ▼
11-28-2005, 03:58 PM
Some information about the display change ( green to black ) can be found here: And about the keys: to the best of my knowledge all Singapore made HP-48 have double-shot injected keys, while the Indonesian made have painted keys. So the timeline regarding these issues is something like this:
1994-xx-yy - Change from ROM version P to R But it really would be nice to have these dates more precise. Bo |